After a couple of races, Indy and Pocono, with the two-day format for the Cup teams, I have to say that I like it. And, the deal at Pocono, with qualifying and the race on the same day, seemed like a success.
First and foremost, the two-day shows should be a cost-savings for the teams. I don't think that it's any extra burden for the teams; making the days longer. The simple fact is, that, at Pocono, the garage would have been open by, like, 8:00 anyway. So, the day really wasn't any longer.
Frankly, I find that, oftentimes, the less time the teams have to prepare for a race, the better the show.
A friend of mine was at Pocono Sunday with her family and told me that, for the most part, they enjoyed the double-header of sorts. The key for schedules like these, is that the tracks allow the fans to leave the grandstands between the events so they can visit fan experiences or return to their cars to tailgate.
As long as that's the case, and the drivers have time for their sponsor commitments, I see it as a win-win. (Unless the local hotels want to keep charging 3-night minimums.)